{
  "manageEntity": {
    "action": "Save",
    "entityId": "919942967",
    "entityType": "Track",
    "nonce": "0x54ea6c1d8a0cc45d423bc82097eda3fc8ba23f579493da2fbfc4dd32be025910",
    "signature": "0x58ab5f832eee66f6dae194c8c1a9ff57b3367b27522e5cbe48fab2f8bb4732094b8aa3cf7f1e4e4c5b02485fdfe1475316897fe99389777e34f5374f2d0499b81b",
    "signer": "0x89d83Bb2BF0C1Ad6B0dB1DE16DA35a110Ae37a6C",
    "userId": "871535685"
  }
}